Conrad Bain, the actor who played the father figure on the sitcom "Diff'rent Strokes," has died, a source close to the Bain family confirmed to FOX411.

Bain died Monday night in Livermore, Calif., at the age of 89. His cause of death was unclear, but his daughter Jennifer told TMZ: "He was an amazing person. He was a lot like Mr. Drummond, but much more interesting in real life. He was an amazing father."

Bain's death leaves only one surviving member from his "Diff'rent Strokes" TV family. Dana Plato, who played his daughter Kimberly, died in 1999 of a drug overdose. Gary Coleman, who played adopted son Arnold Jackson, died in 2010 after a fall down a flight of stairs in his home. Only Todd Bridges, who played his adopted son Willis Jackson, remains.

When reached for comment, Bridges' manager had not yet heard of Bain's reported passing.

Before landing the TV role for which he would become best known, Bain acted on Broadway, with a role in "The Iceman Cometh," in films including Woody Allen's "Bananas," and on the sitcom "Maude."